The best customer is the one you already have - at least, that's what's often said in the remodeling industry. Build a relationship with a customer, and he'll have you back again and again. How can a deck specialist, though, make that model work? The answer is maintenance - the 800-lb. gorilla in the room with a deck builder and his customers. When folks decide to add a deck to their home, they picture it freshly completed and looking brand new. Who wants to dash that vision during the sales call by bringing up something as mundane as maintenance? But